I accidentally fixed Stagefright in FRG01B, but how do I do it in FRG22D?

I copied the bin folder from the SS4.7 ROM (which includes the official Google fix) to the stock FRG01B ROM and it "fixed" the audio problem, but when I tried the same thing with FRG22D it didn't help . I'm happy with FRG01, but I hear FRG22D is faster and has better battery life. Anyone know why it worked with FRG01B but not with FRG22D?

I realize that I could just change to a ROM that has the official fix built-in, but the only two that I know include the fix (SS4.7 and UD7) are unacceptably buggy.